CN108628536A - A kind of STM32 and serial ports touch screen communication module of man-machine interface interaction - Google Patents

Abstract

Include turning 232 adapters, RS232 data lines, power module by the minimum system circuit board of main control chip, human-computer interaction touch apparatus, TTL of STM32F103RCT6 the invention discloses a kind of STM32 of man-machine interface interaction and serial ports touch screen communication module；Using STM32F103RCT6 as the minimum system circuit board of main control chip the control to motor is communicated and is realized with human-computer interaction touch apparatus by serial ports and data line；Power module with include being connect by the minimum system circuit board of main control chip, human-computer interaction touch apparatus of STM32F103RCT6.The present invention has a set of communication program for simplifying efficient in touch screen communication level；In embedded system platform level, hardware configuration is simple but the embedded device of rich interface, master control type are enriched, and communication program modularization facilitates transplanting；In Human Machine Interface level, the brief generous control in interface is in good order, allows controller and touch screen real-time communication, humanized design to avoid the generation of some maloperations by Modbus communications protocol.

Description

A STM32 and serial port touch screen communication template for man-machine interface interaction

technical field

This patent belongs to the general template field of Weiluntong touch screen display control program, and specifically relates to the design of a STM32 and serial touch screen communication template that can provide a good interactive environment.

Background technique

In recent years, with the rapid development of industrial automation, the technical performance indicators such as production efficiency, environmental friendliness and reliability of industrial control systems have been significantly improved, but the operation difficulty of industrial control systems has been greatly reduced. Intelligent. Customers of the new generation of industrial control systems have put forward higher requirements for industrial control systems in terms of equipment operability, safety and comfort of equipment operation. This shows that it has become a big problem to support the corresponding human-computer interaction platform for the industrial control system and ensure the quality of the platform human-computer interface. A reliable human-computer interaction platform and a friendly human-computer interface design have become an important part of the development of a new generation of industrial control systems. As a new human-machine interface product, touch screen has been widely used in major automation factories. Using the touch screen can improve the production efficiency of the equipment, and clearly inform the equipment operator of the operation status and production status of the automation equipment. Using the touch screen can simplify the electrical wiring, reduce the number of I/O points of the main control board, reduce production costs, and relatively increase the added value of the entire set of automation equipment.

However, in the development of the human-computer interaction interface of the industrial touch screen, developers need to spend a lot of energy in debugging the lowest-level code, and need to understand the modelbus communication protocol, rs232 serial port and rich knowledge of 32-bit single-chip microcomputer. In the process of debugging, it is often a lot of work on the communication between the communication protocol and the industrial control screen, which consumes a lot of time and affects the progress of the project.

patent content

The purpose of this patent is to provide a STM32 and serial touch screen communication template for man-machine interface interaction. During the development of industrial control man-machine interface, you can focus all your energy on the functions required for development and debugging, and reduce development costs. Shorten the development cycle and increase the reliability and stability of the program. In the field of education, this method can be used as an excellent routine for the development of entry-level industrial control screens, 32-bit single-chip microcomputers and modelbus protocols.

The technical scheme adopted in the present invention is: a communication template of STM32 and serial port touch screen for man-machine interface interaction, characterized in that it includes the minimum system circuit board with STM32F103RCT6 as the main control chip, man-machine interaction touch equipment, TTL to 232 turns Connector, RS232 data cable, power module;

The minimum system circuit board with STM32F103RCT6 as the main control chip communicates with the human-computer interaction touch device and realizes the control of the motor through the TTL to 232 adapter, serial port and RS232 data line;

The power supply module is connected with the minimum system circuit board including the STM32F103RCT6 as the main control chip, and the human-computer interaction touch device.

The advantage of the design of the communication template between stm32 and serial port touch screen of the patent man-machine interface interaction is: on the level of touch screen communication, there is a set of simplified, complete and efficient communication program (including identification of data frame, transmission of data frame and extraction of communication content, etc.) ; On the level of the embedded system platform, an embedded device with a simple hardware structure but rich interfaces is selected, with rich types of main control, modular communication program, and easy transplantation; on the level of man-machine interface design, the interface is simple and elegant, and the controls are well-organized , Through the Modbus communication protocol, the controller can communicate with the touch screen in real time to display data, and the humanized design can avoid some misoperations.

Description of drawings

Fig. 1 is a frame structure diagram of an embodiment of the present invention;

Fig. 2 is the STM32 data frame identification flowchart of the embodiment of the present invention;

FIG. 3 is a flow chart of sending data frames according to an embodiment of the present invention;

FIG. 4 is a flow chart of the implementation of the CRC-16 check in the STM32 according to the embodiment of the present invention.

Detailed ways

In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

Please see Fig. 1, a communication template of STM32 and serial port touch screen provided by the present invention is characterized in that it includes the minimum system circuit board with STM32F103RCT6 as the main control chip, human-computer interaction touch equipment, TTL to 232 turns Connector, RS232 data line, power module; the minimum system circuit board with STM32F103RCT6 as the main control chip communicates with the human-computer interaction touch device and realizes the control of the motor through the TTL to 232 adapter, serial port and RS232 data line; the power module and Including the minimum system circuit board with STM32F103RCT6 as the main control chip, human-computer interaction touch device connection.

The human-computer interaction touch device in this embodiment is a Weiluntong TK6070IQ touch screen, and the adapter is a TTL-to-232 adapter of the MAX3232 chip.

The human-computer interaction touch device in this embodiment includes a download mode selection module, an operating speed setting module, a processing head wear compensation module, a parameter initialization module, a debugging mode speed setting module, a coordinate display module, a zeroing status light, and a zeroing setting module , manual coordinate position movement module, running stop control module; download mode includes SD card download mode and serial port download mode; download mode selection module, used to select the transmission mode of G code; running speed setting module, used to adjust the speed when the program is running Speed; the machining head wear compensation module is used to perform tool compensation by setting relevant values; the parameter initialization module is used to store the data input by the user into the lower computer buffer for use when the template is turned on; the speed setting module in debugging mode is used to Running speed setting in debug mode; coordinate display module, used to display the change of coordinate value when the template is running; zero status light, which is the template zero status indicator; zero setting module, used to set the template to return to the origin; manual The coordinate position movement module is used to control the position change of the coordinates through the X\Y\Z direction buttons in the non-executing G code stage; the running stop control module is used for pause and emergency stop control.

Extract the necessary parameters and match the corresponding interface controls, each control has a relatively independent address. The human-computer interaction touch device mainly sets the coil state (0x_n) state and int register state in the Modbus-RTU communication association to define the variables on the interface, and connects the STM32 to the interface to complete the development of the human-machine interface. Use the interface development The program can verify and simulate the use effect online. Corresponding to the parameter table, add the parameter name and number to the communication protocol. Because the serial number acts as an array subscript, use the #define statement to associate the parameter name with the communication protocol through the subscript, and pay attention to adding the parameter indicating the total number at the end. These two are used separately by the lower computer and are indispensable.

The interface software should also be prepared for simulation. After selecting the corresponding screen, you need to modify the connection properties, such as the baud rate should be the same as the lower computer, the COM port should be the same as the USB to TTL board plugged into the computer, etc. After the configuration is complete, connect the STM32 to the computer via USB to TTL, click on the online simulation to test whether the man-machine interface is successful; if the simulation is normal and the controls are used flexibly, the communication is successful. The next step is to use the man-machine interface for the actual use of the lower computer.

In this embodiment, the minimum system circuit board with STM32F103RCT6 as the main control chip communicates with the human-computer interaction touch device, including the following steps:

Step 1: STM32 data frame identification;

The realization of communication between STM32 and human-computer interaction touch devices consists of two steps: STM32 data frame identification and data frame transmission. The human-computer interaction touch device mainly transmits RS232 signals, and outputs TTL signals through an RS232-to-TTL module to connect with the microcontroller, and interact through the serial port. The two follow the Modbus-RTU communication protocol.

There are four types of data frames that STM32 needs to recognize: coil status reading, coil status modification, register status reading, and register status modification. The data frame communicates through the STM32 serial port, and the size of the receiving register is one byte, that is, as many bytes as there are in the data frame, the serial port receives as many times as necessary. The data frame sent by the touch screen as the host to the slave is fixed at eight bytes per frame, and its content and distribution are shown in Table 1 below:

Table 1

Device No function code address high and low Address information check digit (tail) 1 byte 1 byte 2 bytes 2 bytes 2 bytes

Taking advantage of the fixed format and length of the received data frame, see Figure 2, the STM32 data frame is identified as follows:

① Define a char array with a size of 8 to collect the data received by the serial port;

②Every time a piece of data is received, the array is moved forward by one unit except for the highest bit, and the latest received data is placed in the last bit;

③The device number of the touch screen is 01. Preliminarily judge whether the highest bit data is 01. If yes, go to the next step. If not, go back to step ②;

④ At this time, the array is very likely to be a complete data frame, and data verification is performed. Judging whether the data of this group of eight bytes is a correct data frame according to the CRC check digit of the last two digits of the array, if so, proceed to the next step, if not, proceed to step ②;

⑤ At this time, it is necessary to distinguish the type of the data frame, and determine which of the second digit of the array is 01, 03, 05 or 06. 01 is to read the state of the coil, that is, the state of the Boolean register; 03 is to read the state of the value register, that is, the state of the int type register; 05 is to modify the state of the Boolean register; 06 is to modify the state of the int type register. After the recognition is completed, call the corresponding function for further processing; among them, the code and function of the function code are shown in Table 2;

Table 2

the code name effect 01 read coil status Get the current status (ON/OFF) of a group of logic coils 03 read holding register Get the current binary value in one or more holding registers 05 Forced Single Coil Forces the on-off state of a logic coil 06 preset single register place a specific binary value into a single register

⑥The function of reading the state extracts the 3rd and 4th bits of the received data array as the address of the start of reading, and the 5th and 6th bits as the number required for reading; the function of modifying the state takes the 3rd and 4th bits of the received data array Bit extraction is used as the address of the modified register, and the 5th and 6th bits are used as the modified content;

⑦ Return the slave data frame to the human-computer interaction touch device, and return to the second step to wait for data reception.

Step 2: send data frame;

For different data frames of the touch screen master, the slave needs to return and send the corresponding data frame as a response. If it cannot respond in time, the touch screen will display a warning that the lower computer system has no response. The modified data frame is returned as the original data frame of the host without any modification; reading the status data frame needs to return the information of the specified register of the slave, so the content and length are slightly different, as shown in Table 3 below. Read data frame format;

table 3

Device No function code Return the number of bytes N return content check digit (tail) 1 byte 1 byte 2 bytes N bytes 2 bytes

Please see Figure 3, the data frame sending process is:

① Define an int type array to send data, the size should be greater than or equal to the sum of all variables related to the communication content of the touch screen;

②If the read function is entered at this time, fill in the device number and function code according to the currently received host data frame;

③ Fill in the number of bytes to send. The number of bytes is a Boolean number for Boolean reading (01 function code), and C language has no Boolean variables, so each Boolean state is stored in the last bit (byte) of a different char variable; for Numeric reading (06 function code) is twice the number of numeric values, because the numeric values use int variables;

④ Fill in the value of the specified register variable in order.

⑤ Perform CRC check on all the filled bytes to get a two-byte check code and put it at the end of the above data;

⑥Send this sending array, end the function and go back to the second step to wait for re-entry.

Please refer to Fig. 4, the implementation of the CRC-16 check in this embodiment in STM32, commonly used look-up table method and calculation method.

The calculation method is generally:

① A 16-bit register is preset as hexadecimal FFFF (that is, all 1), and this register is called a CRC register;

② XOR the first 8-bit binary data (the first byte of the communication information frame) with the lower 8 bits of the 16-bit CRC register, put the result in the CRC register, and keep the upper 8-bit data unchanged;

③ Shift the content of the CRC register to the right by one bit (towards the lower bit), fill the highest bit with 0, and check the shifted out bit after the right shift;

④ If the shifted out bit is 0: Repeat step 3 (shift right again by one bit); if the shifted out bit is 1, the CRC register is XORed with the polynomial A001 (1010 0000 0000 0001);

⑤ Repeat steps 3 and 4 until the right shift is 8 times, so that the entire 8-bit data has been processed;

⑥ Repeat steps 2 to 5 to process the next byte of the communication data frame;

⑦ After all the bytes of the communication information frame are calculated according to the above steps, the high and low bytes of the obtained 16-bit CRC register are exchanged; ⑧The content of the finally obtained CRC register is: CRC code.

The polynomial A001 in the above calculation steps is the result of bitwise inversion of 8005.

The look-up table method is to make the calculation result of the shift XOR into a table, that is, put 0~256 into the lower eight bits of a 16-bit register, fill the upper eight bits with 0, and then combine the register with the polynomial 0XA001 follow the above steps 3 and 4 until all eight bits are shifted out, and the value in the final register is the data in the table, with a separate table for the upper eight bits and lower eight bits.

It should be understood that the parts not described in detail in this specification belong to the prior art.

It should be understood that the above-mentioned descriptions for the preferred embodiments are relatively detailed, and should not therefore be considered as limiting the scope of the patent protection of the present invention. Within the scope of protection, replacements or modifications can also be made, all of which fall within the protection scope of the present invention, and the scope of protection of the present invention should be based on the appended claims.

Claims (5)

1. a kind of STM32 and serial ports touch screen communication module of man-machine interface interaction, it is characterised in that：Including with STM32F103RCT6 is that the minimum system circuit board, human-computer interaction touch apparatus, TTL of main control chip turn 232 adapters, RS232 Data line, power module；

It is described using STM32F103RCT6 as the minimum system circuit board of main control chip by TTL turn 232 adapters, serial ports and RS232 data lines are communicated and are realized the control to motor with human-computer interaction touch apparatus；

The power module with it is described include using STM32F103RCT6 as the minimum system circuit board of main control chip, human-computer interaction Touch apparatus connects.

2. the STM32 and serial ports touch screen communication module of man-machine interface interaction according to claim 1, it is characterised in that： The human-computer interaction touch apparatus is that prestige synthetic fibre leads to TK6070IQ touch screens, and adapter is that the TTL of MAX3232 chips turns 232 switchings Head.

3. the STM32 and serial ports touch screen communication module of man-machine interface interaction according to claim 1, it is characterised in that： The human-computer interaction touch apparatus includes downloading mode selecting module, speed of service setup module, processing head wear-compensating mould Block, parameter initialization module, debugging mode speed setup module, coordinate display module, clean state lamp, zero setup module, Manual co-ordinate position mobile module, operation stop control module；

The downloading mode includes SD card downloading mode and serial ports downloading mode；The downloading mode selecting module, for selecting G The transmission mode of code；The speed of service setup module, for adjusting speed when program operation；The processing head abrasion Compensating module, for carrying out cutter compensation by setting correlation values；The parameter initialization module is switched on for the template When data input by user be stored in slave computer buffering area for using；The debugging mode speed setup module, in debug moulds Speed of service setting under formula；The coordinate display module, the variation of coordinate values when for showing the template running；It is described Clean state lamp is the template clean state indicator light；The zero setup module, for the template Aligning control to be arranged； Manual co-ordinate position mobile module, for the non-executing G code stage by X Y Z arrow button control coordinate position Variation；The operation stops control module, for pause and emergency stop control.

4. the STM32 and serial ports touch screen communication module of man-machine interface interaction according to claim 1, it is characterised in that： It is described to be communicated with human-computer interaction touch apparatus by the minimum system circuit board of main control chip of STM32F103RCT6 including following Step：

Step 1：STM32 data frames identify；

Step 1.1：The char type arrays that a size is 8 are defined to be used for collecting the data that serial ports receives；

Step 1.2：A data are often received just by array except highest order is whole to one unit of Forward, the newest data received are put In last position；

Step 1.3：Touch panel device number is 01, tentatively judges whether the data of highest order are 01, is to carry out next step, is not It then turns round and executes step 1.2；

Step 1.4：Carry out data check；The data of this eight byte of group are judged according to last two CRC check positions of array Whether it is correct data frame, if then carrying out in next step, step 1.2 is executed if not then turning round；

Step 1.5：The type for distinguishing this data frame judges array second to be any in 01,03,05 or 06；01 is reading Take coil state, i.e. Boolean register state；03 is reading numerical values buffer status, i.e. int types buffer status；05 is modification Boolean register state；06 is modification int type buffer status；Corresponding function is called to be further processed after the completion of identification；

Step 1.6：The address that the function of reading state starts the 3rd, 4 extraction of array for receiving data as reading, the 5th, 6 Position is as the number for reading needs；The function of modification state will receive the 3rd, 4 extraction of array of data as modification register Address, the 5th, 6 as modification content；

Step 1.7：Slave data frame is returned to human-computer interaction touch apparatus, step 2 is executed and waits for data receiver；

Step 2：Data frame is sent；

Step 2.1：It defines an int type array and is used for transmission data, size should be greater than setting with human-computer interaction touch equal to all The summation of standby Content of communciation relevant variable；

Step 2.2：If entering function reading at this time, according to the host data frame being currently received, device number and function are inserted Code；

Step 2.3：Content byte number filling will be sent；Byte number is Boolean type number for Boolean type reading, will be each Boolean type state is stored in last position of different char types variables；It is the two of numeric type number for numeric type reading Times, because numerical value uses int type variables；Boolean type reads corresponding 01 function code, and numeric type reads corresponding 06 function code；

Step 2.4：The value for specifying register variable is inserted in order；

Step 2.5：All bytes inserted are subjected to CRC check, the check code that size is two bytes is obtained, is put into above The tail portion of data；

Step 2.6：By this transmission array send, terminate function return to step 2.2 carry out wait for be again introduced into.

5. the STM32 and serial ports touch screen communication module of man-machine interface interaction according to any one of claims 1-4, It is characterized in that：CRC-16 verifies the realization in STM32, including look-up table and calculating method；

The calculating method, specific implementation include the following steps：

1. preset 1 16 registers are hexadecimal FFFF, this register is referred to as CRC registers；

2. first 8 bit binary data are different with 16 least-significant bytes of CRC registers or, result is put in CRC deposits Device, high eight-bit data are constant；

3. the content of CRC registers, which is moved to right a use 0, fills up highest order, and checks the shift-out bit after moving to right；

4. if shift-out bit is 0：The 3rd step is repeated, moves to right one again；If shift-out bit is 1, CRC registers and multinomial A001 carries out exclusive or；

5. repeating step 3 and 4, until moving to right 8 times, 8 data entire so are all handled；

6. repeating step 2 arrives step 5, the processing of the next byte of communication data frame is carried out；

7. after the completion of all bytes of communication information frame are calculated by above-mentioned steps, the high and low word of 16 obtained CRC registers Section swaps；

8. the CRC content of registers finally obtained is：CRC code；

The look-up table is that the result of calculation for shifting exclusive or has been made a table, and it is 16 to be put into a length by 0~256 Register in low eight, high eight-bit filling 0, then by the register and multinomial 0XA001 according to 3,4 step in calculating method Suddenly, it is all removed until eight, the value in last register is exactly the data in table, high eight-bit, eight individually one low A table.